Choice Of Engine

All the common makers of diesel engines have machines suitable for trawler yachts. Furthermore most have worldwide dealerships. In a purely technical sense there is little to choose between makes, so often the choice of machine is for price or personal preference reasons.

The choice of engine can be broadly divided into 2 main types:

1. Medium Speed Engines

These used to be common in a power range up to 400 BHP @ 900 to 1500 rpm. These machines have high mechanical efficiency and simplicity but suffer from the disadvantage of great size and weight.

An example is the GARDNER 8L3B diesel rated at 230 BHP @ 1150 rpm and 250 BHP @ 1250 rpm respectively. We have fitted a number of these in the past. While these certainly are a wonderful engine, they are 12 feet long and weight nearly 4 tons so are only suitable for larger motor yachts.

Gardner 8L3B

2. High Speed Engines

These engines have operating speeds of 1800 to 2500 rpm and there are makes and models suitable for all trawler yachts. Typically each engine series is available in 3 aspirations:

1. Naturally aspirated
2. Turbo charged
3. Turbo charged and intercooled

And 3 service ratings:

1 Pleasure rating
2 Medium Continuous Rating
3 Continuous Rating

With the first two of these ratings there is a limit on the daily full power usage of the engine, in the case of the Medium Continuous Rating it is for 6 hours out of every 12 hours, along with a maximum annual usage as well. This makes these two ratings unsuitable for an ocean cruising vessel. So the Continuous Rating should always be chosen. With a Continuous Rating there is no limit on the daily or annual usage times.

John Deere

Most new engine installations carry an overall warranty of 12 months and an extended warranty for the internal parts of the engine i.e. crankshaft, connection rods and cylinder block. Typically this extended warranty is for 3 years or 1,000 hours which ever comes first.

Last Updated (Saturday, 31 October 2015 04:56)